-- completeopt is used to manage code suggestions
-- menuone: show popup even when there is only one suggestion
-- noinsert: Only insert text when selection is confirmed
-- noselect: force us to select one from the suggestions
vim.opt.completeopt = {'menuone', 'noselect', 'noinsert', 'preview'}
-- shortmess is used to avoid excessive messages
vim.opt.shortmess = vim.opt.shortmess + { c = true}

local cmp = require'cmp'
cmp.setup({
  snippet = {
    expand = function(args)
      require('luasnip').lsp_expand(args.body) -- For `luasnip` users.
    end,
  },
  mapping = {
    -- Shift+TAB to go to the Previous Suggested item
    ['<Up>'] = cmp.mapping.select_prev_item(),
    -- Tab to go to the next suggestion
    ['<Down>'] = cmp.mapping.select_next_item(),
    -- CTRL+SHIFT+f to scroll backwards in description
    ['<C-S-f>'] = cmp.mapping.scroll_docs(-4),
    -- CTRL+F to scroll forwards in the description
    ['<C-f>'] = cmp.mapping.scroll_docs(4),
    -- CTRL+SPACE to bring up completion at current Cursor location
    ['<C-Space>'] = cmp.mapping.complete(),
    -- CTRL+e to exit suggestion and close it
    ['<C-e>'] = cmp.mapping.close(),
    -- CR (enter or return) to CONFIRM the currently selection suggestion
    -- We set the ConfirmBehavior to insert the Selected suggestion
    ['<CR>'] = cmp.mapping.confirm({
      behavior = cmp.ConfirmBehavior.Insert,
      select = true,
    })
  },

  -- sources are the installed sources that can be used for code suggestions
 sources = {
      { name = 'path' },
      { name = 'nvim_lsp', keyword_length = 3 },
      { name = 'nvim_lsp_signature_help'},
      { name = 'nvim_lua', keyword_length = 2},
      { name = 'buffer', keyword_length = 2 },
      { name = 'vsnip', keyword_length = 2 },
 }
})